Didn't search this thread but you can find digital/paperback cookbook sales here "https://www.ereaderiq.com/" Amazon changes their prices daily and you can search by price.
And if you're searching for deals on Amazon, add this the Amazon https line : To see which ones are 50 percent off, add &pct-off=50- to the end of the search URL. How about ones that are between 50 and 70 percent off? Simply add &pct-off=50-70 to the URL, and you're good to go. If you're looking for older cookbooks, https://www.abebooks.com has decent prices.